Java獲取線程ID的實例

以下實例演示了如何使用 getThreadId() 方法獲取線程id：

public class Main extends Object implements Runnable { private ThreadID var; public Main(ThreadID v) { this.var = v; } public void run() { try { print('var getThreadID =' + var.getThreadID()); Thread.sleep(2000); print('var getThreadID =' + var.getThreadID()); } catch (InterruptedException x) { } } private static void print(String msg) { String name = Thread.currentThread().getName(); System.out.println(name + ': ' + msg); } public static void main(String[] args) { ThreadID tid = new ThreadID(); Main shared = new Main(tid); try { Thread threadA = new Thread(shared, 'threadA'); threadA.start(); Thread.sleep(500); Thread threadB = new Thread(shared, 'threadB'); threadB.start(); Thread.sleep(500); Thread threadC = new Thread(shared, 'threadC'); threadC.start(); } catch (InterruptedException x) { } }} class ThreadID extends ThreadLocal { private int nextID; public ThreadID() { nextID = 10001; } private synchronized Integer getNewID() { Integer id = new Integer(nextID); nextID++; return id; } protected Object initialValue() { print('in initialValue()'); return getNewID(); } public int getThreadID() { Integer id = (Integer) get(); return id.intValue(); } private static void print(String msg) { String name = Thread.currentThread().getName(); System.out.println(name + ': ' + msg); }}

以上代碼運行輸出結果為：

threadA: in initialValue()threadA: var getThreadID =10001threadB: in initialValue()threadB: var getThreadID =10002threadC: in initialValue()threadC: var getThreadID =10003threadA: var getThreadID =10001threadB: var getThreadID =10002threadC: var getThreadID =10003

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